The microwave background we now observe dates back to ________ of matter and energy at 3,000 K
Fill in the blank(s) with correct word
decoupling
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In the straight-ahead direction (? = 0°) in Fraunhofer diffraction, which of the following is observed on the screen?
a. a minimum equal in width to the adjacent minima b. a minimum double in width to the adjacent minima c. a maximum equal in width to the adjacent maxima d. a maximum double in width to the adjacent maxima
Neutron stars are expected to spin rapidly because
a. they conserved angular momentum when they collapsed. b. they have high orbital velocities. c. they have high densities. d. they have high temperatures. e. the energy from the supernova explosion that formed them made them spin faster.
What is the kinetic energy of a 200-kg satellite as it follows a circular orbit of radius 8.0 × 106 m around the Earth? (Mass of Earth = 6.0 × 1024 kg.)
A. 5.0 × 109 J B. 1.0 × 1010 J C. 1.5 × 1010 J D. 2.0 × 1010 J E. 2.5 × 109 J
A massive star can fuse more and more massive nuclei, but this process is limited by the fact that, at some point, an element that is produced ____
a. becomes completely degenerate in the core, changing the pressure-temperature relationship b. cannot produce energy through fusion c. will only fuse in the presence of even more massive nuclei d. is not found in nature e. decays radioactively before it can undergo fusion